Improvement in insulators foe telegraph wires



A. B. DAY. INSULATOR FOR TELEGRAPH WIRES.

No. 65,886. Patented June 18, 1867.

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-ALFRED LB. DAY, OF GREEK, WISCONSIN.

Letters Patent No. 65,886, elated June 18, 1867.

IMPROVEMENT IN INSULATORS FOR TELEGRAPH WIRES.

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TO ALL WHOM 1: Mar CONCERN:

Be itkno'wn that I, ALFRED ILDAY, of Oak Creek, in the.couut'y,.o.f.lllilwaukee, and State of Wisconsin, have. invented ancw'and improved Insulator for Telegraph Wires; and I do hereby declarethat the following is a. full, clear, and exact description thereof,which will enable those. skilled in the art to make and use the same,reference being had to the accompanying drawings, forming part of thisspecification, in whieh- Figure 1 represent a vertical sectional view-ofmy improved shank insulator, the line a: re, fig. 3, indicating theplane of section.

Figure 2 is a similar view of an insulator that is to be attached to across-arm.

Figure 31s a horizontal sectional view of the insulator, the plane ofsection being indicated by the line 1/ 1. s-

Similar letters of reference indicate corresponding parts. I The objectof this invention is-to provide an insulator for telegraph wires with adead-air chamber by combining a wooden plug, a number of glass lugs, anda. wooden disk-in such a manner with a cast-iron shell that only a verysmall orifice is left around the pin-hook for the atmosphere to enter,and any moisture entering by that orifice will, by reason of the lowertemperature of the iron shell, condense and settle thereon, leaving thewooden plug and the glass lugs very nearly in a. dry and non-conductingstate.

A represents in cast-iron cylindrical shell, open at the top, and withbut a small orifice, a, at the bottom.

On the inside of the shell are provided grooves or guides I) b, in whichfour, more or less, glass lugs, B, are placed, and prevented from movingsideways, their lower ends resting on a flange, e. in the shell A. Theseglass lugs are made almost triangular, as shown in fig. 3, the outercorner being rounded, as shown. At their lower ends they are wider thanat. the top. A conical wooden plug, 0, provided with four, more or less,grooves onits outside, is placed froin abov e into the shell, and theedges of the lugs B fit into the grooves in C, and the tapering form ofthe said lugs prevents the plug from being lowered beyond a certainmark. A pinhook, I D, of usual construction, and, with a screw-shank, d,is placed from below through the orifice a into the side' ofthe cylinderA-. Before the lugs B or plug C are inserted into the shell, a. woodencircular: disk, E, is placed from above over the shank of the pin-hookI). When the plug C is placed between the lugs, the pin-hook D isscrewed into the plug until the disk E is held-between a flange, a, MDand the plug, so that its lower surface is held a little above thebottom of the shell. -A glass lug, F', is then placed on top of the plugC, and the shell A is then closed with a cover, so that the said coverwill come in contact with the glass knob F. Where the shell A isprovided with an iron sercw shank, ll, to be fastened directly to apole, or to the side of a bullding, the cover is screwed on the shell,or it is provided with grooves, whereby it is held on pins ff,projecting from the sides of the shell A, as shown-in fig. 1. But whenthe outside of the shell isprovidcd with a screw-thread, so that thesame can be screwed into'a cross-head, I, as shown in fig. 2, then thecover G can be made of sheet iron, and will beheld in'place' by forcingit against the top of the cavity into which the whole instrument isplaced.

By the aforesaid arrangement I obtain a very great surface for thedead-chamber, which will be almost an area of one hundred square inchesin a full-size insulator. The dead-air chamber is entirely excluded fromthe atmosphere,.ex eept at the small orifice around the pin-hook. It isevident that any moisture entering by that orifice will, by reason ofthe lower temperature of the iron shell, condense and settle first onthe said shell, leaving the wooden plug and glass lugs very nearlyin adry and non-conducting stat But even assuming that all the moistureentering the chamber should condense evenly upon the whole surface ofthe chamber, it is improbable that, even in the longest storm, asufficient quantity of moisture can accumulate to form the least escape.

When put together, this insulator should be dipped in asphalte or coaltar for the purpose of closing all crevices around the cover, and alsofor protecting the shell itself.

I claim as new, and desire to secure by Letters Patenty 1. The lugs 13and 1*, made of glass or other suitable non-conducting material, incombination with the wooden plug C on the inside of the cast-ironcylinder A, all made and operating substantially as herein shown anddescribed. l

2. So constructing the shell A that the cap G can be held down by thecross-head I when the insuletor is attached to the same, all as hereinshown and described.

ALFRED B. DAY. W-itu essas Jams Moons, SAMUEL W. DAY.

